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The WN-3420 WAN E1, 1-port, SmartCard performs frame-level testing at full wire-rate for Frame Relay and PPP access devices, routers and switches. It provides an RJ-48C interface (for 120 Ohm balanced) at line rates up to E1 (2.048 Mbps) in 64 kbps increments. For use with the SMB-200 or SMB-2000, requiring one slot.